Eric hartwig whyteheab



July 28, 1925.

1,547,278 E. H- WHYTEHEAD EXTRA. AIRLDEVICE FOR INTERNAL couBus'Monmamas Filed Nov. 4, 1924- Patented July 28, 1925.

- UNITED STATES ars -I-IARTWIG wnvrnnnan, or DELMQRE, rnensv AL, scornrman.

EXTRA-AIR DEVICE FOR INTERNAL-COMBUSTION ENGINES.

Application filed November fl '0 all whom it may concern:

Be it known that I, Euro HARTWIG VVHYTEHEAD, a British subject, residingat Delmore, Transvaal Province, Union of South Africa, have inventedcertain new and useful lmprovenients in Extra-Air Devices forInternal-Combustion Engines, of which the following is a specification.

The present invention has reference to means for supplying additionalair to the induction systems of internal combustion engines.

An object of the invention is to provide means in conjunction with theextra air supply device for visually indicating the degree of vacuumunder which the air is admitted.

A further object is to provide in conjunction with a manually adjustablevalve for controlling the extra air, a visual indicator which assists insetting or re-setting the valve according to the condition of theengine, the altitude, and other circumstances aifecting the amount ofextra air required.

In the accompanying drawing Fig; I is a view from the front of the dashboard; and Fig. II is a view at right angles to Fig. I, partly sectionedand showing the engine connection.

2 indicates a socket which is preferably provided with a transverseflange 3 for securing it to the dash board 4. Said socket ends in atubular stem 5 which extends through the dash board. A pipe 6 connectsthe stem tothe induction manifold 7 of the engine 8.

The socket 2 is internally threaded, and into it screws an externallythreaded hollow sleeve 9. The sleeve 9 may be provided with a raisedandmilled edge 10 to facilitate turning it. 11 is a lock nut on thesleeve and 12 packing material between the lock nut and end of thesocket for making an air tight joint around the outside of the sleeve.

At the inner end of the sleeve is formed a valve seat 13 with whichco-operates a valve 14. The latter may be guided for movement by wings15 sliding in the bore 16 of the sleeve. The valve is pressed to theseat by a spring 17, which may be seated in a recess 18 in the bottom ofthe socket.

19 is a vacuum gauge connected by the pipe 20 to any suitable point ofthe system 4, 1924. Serial No. 747,804.

within the control of th-evalve 14. Said pipe is conveniently connectedto the stem 5, the gauge 19 being supported in the flange 3 and soplaced that its hand 21 and dial 22 are visible to the driver.

The dial 22 is provided with any ordinary or arbitrary scale 23 withwhich the hand 21 co-operates.

At low engine speeds the valve 14 remains on its seat 13, but as theengine speed rises and the vacuum in the induction system consequentlyincreases, the valve lifts. Air is thereby admitted through the sleeve9, the socket 2 and pipe 6 into the induction manifold 7. I

Once the valve 14 has opened, the vacuum in the socket does not vary toany great extent, increased suction at the manifold being met by greaterlift of the valve and corresponding increase in the inflow of extra a1r.

By screwing the sleeve 9 into or out of the socket 2 the resistanceoffered by the spring 17 to the opening of the valve is increased ordecreased. The position of the sleeve for the most favourable running ofthe engine may be determined by trial, and the sleeve fixed in thatposition by means of the lock nut 11.

Variations of altitude or temperature, or the changes which graduallyoccur in the mechanical condition of the engine, are met bycorresponding adjustments of the sleeve.

The vacuum gauge 19 facilitates such adjustments. Vhen the sleeve hasbeen set for normal running, upon the engine being started and broughtup to speed the hand 21 of the gauge moves from zero until the valvelifts, and it remains substantially at the point then reachednotwithstanding increased engine speed. lVhatever adjustments of thesleeve are made, are visually indicated by the hand 21; and restorationof the sleeve to the normal position, after the adjustment has beendisturbed for any reason, is readily attained by observing the positionof the hand.

I claim.

Extra air supplying means for internal combustion engines comprising abase for arrangement on an instrument board and provided with a socketand a duct leading from said socket and arranged for connection to theinduction system of an engine,

a vacuum gauge on said base, a duct leading from the gauge to the firstnamed duet, a sleeve threadedly connected to the socket forming an airintake leading to the socket 5 and provided at its inner end with avalve seat, a valve arranged to close said seat, and a spring arrangedin the socket and normally closing the valve, the said sleeve beingmanually adjustable and serving to vary the tension of said spring. 10

In testimony whereof I have hereunto set my hand.

ERIC HARTWIG XVHYTEHEAD.

